The Lone Journey
There is an amazing Mantra in Atharva Veda (19.56.1) which is really thought provoking as it mention about our last and lone journey (death) and a necessity for serving mentality.
यमस्य लोकादध्या बभूविथ प्रमदा मर्त्यान्प्र युनाक्षि धीराः ।
ऐकाकिनो सरथंयासि विद्वान्त्स्वप्नं मिमानो असुरस्य योनौ ॥ १ ॥
Yamasya Lokadadhyaa Babhoovidha Pramadaa Marthyaanprayunakshi Dheeraa.
Ekaakino Saradam Yasi Vidwaanthswapnam Mimaano Asurasya Yonau.

Meaning:- Oh Scholars! You, the smart ones, have originated from the bright world of Ishwar (God), who is omnipotent and most just (न्यायकारी). You courageously make humans (who are mortals – the ones who die) happy. You alone make your dream journey alone, carrying beautiful things (the balance of Karma Vasanas), with the support of the knowledgeable life giver (Ishwar).

Interpretation:- In this Mantra, many important issues are discussed in question and answer form for the betterment of each individual. Let us arrange them in three sections.
1. The question is from where did you come? It is clear that you came from God. It implies that you had inhabited in Brahma Loka (ब्रह्मलोक) of Salvation (मुक्ति).
2. If only you are courageous, you can make others happy. It also means that it is the responsibility of each individual to give happiness to others. It takes extreme courage to make others happy. How can somebody, who is not strong in character, give happiness to others.
3. This human life is a vast dream. While watching this dream, one day we have to go from here (leaving everything behind) alone. O Human! Is it enough just to walk in the shade of illusion, watching this dream? Is it required to do something which is beneficial to others? Dream world is a field which exhausts us. Leave it. Once we wake up, we cannot see anything in that world (dream world). Similarly, the concept which has not materialized is like a dream. We have to go, leaving behind all these imaginations. The only thing comes along with us in this lone journey is the self-earned Vasanas (accumulated effects of past deeds). The lone passenger is the travelling scholar, going with the burden of Kruta Karma Vasana कृतकर्मवासना:

Manu Smruti says (4-240)
ऐकं प्रजायते जन्तुरेक ऐव प्रलीयते। ऐकोf नुभुङ्क्ते सुकृतमेक ऐव च दुष्कृतम् ।
Ekam Prajayathe Jsnthureka Eva Praleeyathe.
EkOfnubhungkthe Sukruthameka Eva cha Dushkrutham.

Living beings are born alone, die alone. Get results of good deeds alone. So also, gets results of bad deeds alone.

Manu Smruti already said (4-239)
नामूत्रहि सहतार्यथं पितामाता चतिष्ठत:
न पुत्र दारा न न्जातिर्धर्मास्तिष्ठति केवल:
In the other world, there shall be no father, no mother, no children, no wife/husband, no any relatives are there to help. Only Dharma (righteousness) shall be there with each of us. What Veda described as things for entertainment (रमण साधना:), in Manu’s words became Dharma (righteousness). We have to remember the fact that the results of Karmas (actions) done by each individual shall be experienced by respective individuals only, not by any other being. Otherwise, we may do things which are to be totally abhorred (avoided) and may fall in to eternal pain (नित्यदुःख:). We should always remember that we get good results for good actions and bad results for bad actions. This we experience individually, without anybody’s help assistance.

Conclusion:- We shall try to help others, as much and as far as we can. It is the basic requirement to be good human beings. We enjoy/suffer, individually, from the results of all our actions depending on good or bad respectively.

(This is again a rough translation of Veda Mantra Bhashya in Malayalam by (Acharya) Narendra Bhooshan, greatest Vedic scholar of recent times, in his Malayalam Vedic Magazine "Arshanadam". All errors are fully mine and all credits got to Acharyaji, his wife Kamala Narendra Bhooshan, son Vedaprakash & Arshanadam team)